Oberdorfer Bronze Self Priming Pump 20 GPM 1/2 HP # 300B-J19

Oberdorfer Bronze Self Priming Pump 20 GPM 1/2 HP # 300B-J19 (CC)
Item# OBE-PMP-300B J19-K
Availability: ships the next business day

Oberdorfer Bronze Self Priming Pump 20 GPM 1/2 HP # 300B-1-J26 with stainless shaft. Single phase, close-coupled, all bronze, centrifugal marine salt water pump. Designed for use as raw water recirculation pumps on marine air conditioners. They are used by major manufacturers of marine A/C units.


Applications: Marine air conditioner coolant pumps, bilge pumps, recirculation, live bait wells, marine fresh water systems, general liquid transfer. Construction: Casing, semi-open impeller and bracket are bronze. Monel sleeved motor shaft. Single mechanical seal with carbon faces, Buna elastomers and 304 stainless steel metal parts. Mounting: Below or above water line Connections: 1" X 1" female NPT suction and discharge Suction lift: Up to 20 feet Motor: Baldor 1/2 HP, 3450 RPM, Open drip proof, single phase, 115/230 volts, 60 Hz, with ball bearings front and back and built-in overload protection. Clockwise rotation, when facing back of motor. Maximum working temperature: 180 degrees Fahrenheit Carton dimension: 14" high, 12" wide, 18" long. Weight: 32 lbs

Pump Capacity Table
Model HP Total Dynamic Head (TDH)
5 10 15 20 25 30 Shut-off
Gallons Per Minute (GPM)
300B-J19 1/2 20 17 14 12 8 4 35


Oberdorfer Centrifugal Replacement Pump 20 GPM 1/2 HP # 300B (C)

Oberdorfer centrifugal replacement pump (motor not included) for model 300B-1-J26 and 300B-J19

Availability: ships the next business day
Repair Kit for Oberdorfer Centrifugal 300 Series Pump  10865
Availability: ships the next business day

Questions & Answers

Is the Oberdorfer 300B-J19 pump self priming?
A 1/2" pipe plug on the casing top is for initial filling of priming chamber and inlet line-- pump priming is automatic thereafter. I has a suction lift of 15 feet without a foot or check valve (25 foot suction lift using a foot or check valve and a filled inlet line).
Are the Oberdorfer 300B-J19 pumps used for Perchloroethylene?
These pump models are widely used for the pumping of Perchloroethylene.
Can the 300B-J19 pumps be mounted vertically?
No, they must be operated in the horizontal position.
What is the capacity required for marine air conditioning unit?
Based upon the total BTU output of the A/C unit. Most manufacturers select pump size (capacity) based upon the following: 4 GPM (or 240 GPH) for each 12,000 BTU ( 1 Ton A/C)
Can a restrict the discharge flow of the pump?
One centrifugal pump will often serve as the coolant pump for two, three or even four condenser units on the same boat. Restrictor valves may be used on centrifugal pumps to reduce flow to desired amount - without damage to the pump unit.
What is the mounting location of Oberdorfer non self priming pumps A/C pumps?
If pump is to be mounted below the water line and with a flooded suction port, a centrifugal pump is generally preferred. Centrifugal pumps are quiet running, require less amperage, and are less easily damaged by running dry than are rubber impeller type pumps. However, most centrifugal pumps do not have suction lift capability (must have flooded suction to function).
What is the mounting location of Oberdorfer self priming pumps A/C pumps?
If pump is to be mounted above the water line, a self priming unit is essential, such as the 300B-1-F26 Centrifugal above, or Rubber impeller type pumps

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